Use RequestStore to cache the contents of the current License

Fixes #695 

See merge request !566

Merge branch '799-viewing-a-mr-with-approvals-with-an-anonymous-user-results-in-error-500' into 'master'

Don't check if anonymous user can update MR

Closes #799. Interestingly, I think previously we showed the 'Approve MR' button to anonymous users when an MR had approvals from anyone allowed, but we didn't blow up with a 500 error.

See merge request !582

Document how to upgrade from password-based Kerberos



See merge request !575

Display the JSON payload in settings page for EE usage ping

Screenshot:

![image](/uploads/4d6379a73cc66f03000f8aebd31c8355/image.png)


See merge request !580

Licenses are already being destroyed by the `before(:all)` hook,
removing them from a `before(:each)` hook breaks feature specs when we
have multiple `context` blocks.

See: https://gitlab.com/gitlab-org/gitlab-ee/blob/ff9ad690650c23665439499d23f3ed22103b55bb/spec/spec_helper.rb#L50

Performance improvement of push rules

We don't need to check temp ref anymore since  https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/563 is merged

related https://gitlab.com/gitlab-org/gitlab-ce/issues/14280#note_13198239

See merge request !578

[Elastic] Suppress ActiveRecord::RecordNotFound error in ElasticIndexWorker

Fixes https://gitlab.com/gitlab-com/infrastructure/issues/233

See merge request !577

Fix Gemfile.lock

It has been committed during CE->EE merge. Sorry

See merge request !576

Mention Kerberos in CHANGELOG-EE

This was forgotten in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/548

See merge request !574

Fix bad Group class resolution when querying LDAP via API

When querying LDAP groups via the API, there was a 500 error with a strange stack. Thanks to @DouweM we figured out that in the context of the API, it's choosing `::Group` instead of `EE::Gitlab::LDAP::Group`. This makes it just specific enough to work. 

See merge request !572

Improve error text for LDAP group links

See merge request !573

Add ticket-based Kerberos sign-ins

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/745

This is meant as a replacement for omniauth-kerberos. This MR does not rip out or disable omniauth-kerberos, however, because that has the risk of locking out all Kerberos users on Kerberos-enabled GitLab server that does not have a service keytab yet.

On GitLab installations that have a keytab, namely those which have 'git access via SPNEGO' enabled, this change will automatically enable ticket-based sign-ins. 

See merge request !548

Fix autoloading issue in test environment

Always prefer to use the full class namespace when specifying a superclass inside a module, because autoloading can occur in a different order between execution environments.

```ruby
module Foo
  class Base
    def initialize
      raise "This is the wrong super class!"
    end
  end
end

module Foo
  module Bar
    class Sample < Base
      # Inherits from ::Foo::Base because Foo::Bar::Base isn't defined yet
    end
  end
end

module Foo
  module Bar
    class Base
      def initialize
        puts "Success!"
      end
    end
  end
end

> Foo::Bar::Sample.new
=> RuntimeError: This is the wrong super class!
```

The trouble occurs when Rails has already autoloaded `Gitlab::SearchResults` and not `Gitlab::Elastic::SearchResults`. In this case, Rails will never need to autoload `Gitlab::Elastic::SearchResults` because `Gitlab::SearchResults` already matches the superclass. This is why this [build](https://gitlab.com/gitlab-org/gitlab-ee/builds/2464466) only fails when the spec run after `spec/lib/gitlab/search_results_spec.rb`.

/cc @DouweM @rspeicher @vsizov 



See merge request !571

Always prefer to use the full class namespace when specifying a
superclass inside a module, because autoloading can occur in a
different order between execution environments.

Uninitialized constant ElasticIndexerWorker::Client

Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/772

See merge request !554

CE upstream



See merge request !570

CE upstream

@timothyandrew Please resolve:

```
spec/lib/gitlab/git_access_spec.rb
lib/gitlab/checks/change_access.rb
lib/gitlab/git_access.rb
lib/gitlab/git_access_wiki.rb
```

See merge request !568

Use value of `yaml_variables` and `when` from config_processor if undefined

## What does this MR do?
Uses `yaml_variables` and `when` from config_processor if values for these are undefined.

## Why was this MR needed?
Old builds doesn't have this columns initialised. 
Thus makes the retries on these builds to not work properly.
This is regression introduced by https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5296.

## Does this MR meet the acceptance criteria?

- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)


See merge request !5342

Added redirect_to_referer to login link on issues

## What does this MR do?

Adds a `redirect_to_referer` param to login & register links on issues when not logged in. This makes the login box redirect back to the issue after login.

## What are the relevant issue numbers?

Closes #19968 

See merge request !5344

Add support for manual CI actions

## What does this MR do?
This implements a `when: manual` which allows a jobs to be marked as manual actions.
Manual actions have to be explicitly executed by developers.

## What are the relevant issue numbers?
This is to solve: https://gitlab.com/gitlab-org/gitlab-ce/issues/17010

See merge request !5297

Simplify entities for branches and tags API

## What does this MR do?

As talked in !5208, I improved the entity for branches and tags.

## Does this MR meet the acceptance criteria?

~~- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added~~
~~- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
~~- [ ] API support added~~
~~- Tests~~
  ~~- [ ] Added for this feature/bug~~
  ~~- [ ] All builds are passing~~
~~- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)~~
~~- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)~~
~~- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)~~

See merge request !5343